Cyprus Anterior Cervical Plate System Surgical Technique
Contents Introduction... Page 1 Design Features... Page 2 System Components... Page 3 Surgical Technique... Page 6 Additional Surgical Options... Page 12 Closure And Postoperative Care... Page 13 Regulatory Status... Page 14 Sterilization Recommendations... Page 15 Ordering Information... Page 16 Additional Information... Page 18
Introduction The Cyprus Anterior Cervical Plate System offers surgeons simplicity, efficiency and versatility. This anterior cervical plate system is a low profile system that offers surgeons the option of a constrained or semi-constrained construct. The system composed of Titanium Alloy (Ti 6Al-4V ELI) features a simple one step locking mechanism and large visualization windows for great intra-operative and post-operative views of the graft site. Description The Cyprus Anterior Cervical Plate System is intended for anterior interbody bone screw fixation during the development of cervical spine fusion. The spinal fixation device includes Self-Drilling/Self-Tapping and Variable/Fixed Bone Screws, patented spherical thread design and pre-contoured 1-3 level plates. Various instruments are also available as part of the Cyprus Anterior Cervical Plate System for use by the surgeon to facilitate implantation of the device. 1
Design Features Large Intra-operative Visualization Windows Low Profile (1.9mm) 20 Features SphereLock Technology Locking Mechanism Type of Fixation Open Design Titanium Alloy (Ti 6Al-4V ELI) Low Profile Pre-Contoured Plates Plate Selection Bone Screw Options Bone Screw Dimensions Fixed Screw Angulation Variable Screw Angulation Screw Convergence Patented SphereLock Threads 10 Narrow Width (16.5mm) Benefits Encourages alignment between the plate and bone screw interface Self-seats bone screw into the recess of the plate Ease of use for surgeon 10in-lb torque Constrained: Restrict motion; provide additional stability Semi-Constrained: Micro-motion; promotes graft settling through load sharing Intraoperative visualization of the bone graft and the end plate Post-operative visualization and consolidation of the bone graft in the vertebral disc space Excellent imaging compatibility and enhanced biomechanical performance Height: 1.9mm Width: 16.5mm Minimal interference with anatomical structures (i.e. soft tissue) Conforms to the lordotic curvature of the spine Lordosis increases with plate length 1-3 level fusion 1 Level: 12-24mm 2 Level: 24-44mm 3 Level: 44-66mm Plates increase in 2mm increments Self-Tapping/Self-Drilling Fixed/Variable Major: 4mm Rescue/Salvage Major: 4.75mm Minor: 2mm Rescue/Salvage Minor: 2.75mm Lengths: 12/14/16mm 10 Fixed trajectory cephalad and caudal Saggital plane is neutral (0 ) 20 Cone of angulation 10 screw placement in any plane (i.e. cephalad, caudal, midline, away from midline) 10 in the axial plane 2
System Components Self-Drilling/Self-Tapping Bone Screws There are Self-Tapping and Self-Drilling Bone Screws with the system. All bone screws are color-coded by length and are available in 4mm (primary application) and 4.75mm (salvage application). Bone screw lengths are 12mm to 16mm in 2mm increments. Self-Tapping Self-Drilling Bone Screw Lengths Variable Bone Screw The Variable Bone Screw features a unique Poly-Axial Bone Screw head that is independent of the bone screw shaft. This feature creates a 20 cone of angulation; allotting for 10 in any direction. 4.75mm Salvage 4mm Primary Fixed Bone Screw The bone screw threads interlock with the threads of the plate at a preset 10 trajectory cephalad/caudal. Spherical Thread Design Both the threads of the plate and the threads of the bone screw resemble a sphere, which provides optimal plate/screw alignment. The spherical thread design allows the bone screws to self center; thereby facilitating surgeon ease of use. Plate Selection Plates are available for 1, 2, or 3 level cervical spine fusion. Plates range from 12-66mm in increments of 2mm. Plates are pre-contoured to conform to the natural lordosis of the cervical spine. Lordosis varies, gradually increasing with the size of the plate. 3
System Components (Continued) Cyprus Anterior Cervical Plate System Instruments Caliper Plate Tack Plate Bender Quick Connect Handle Plate Holder Drill Bits (Disposable) Tack Inserter Variable Adjustable Awl 4
System Components (Continued) Awl Soft Tissue Sleeve Variable Drill Guide Tube Screw Driver Fixed Drill Guide Tube Revision Screw Remover Torque Limiting Quick Connect Handle 5
Surgical Technique Surgical Approach And Preparation The patient is positioned supine on the operative table with a folded towel beneath the intrascapular region to maintain the head in slight extension. The use of a head halter attached to an outrigger for traction may be helpful. If fluoroscopy is used, it can be utilized at this point to confirm positioning and check that desired vertebral levels can be adequately visualized. (See Figure 1) Figure 1 The standard anterior approach to the cervical spine is utilized. This can be through one of several incisions with the exposure typically medial to the carotid sheath and lateral to the trachea and esophagus. Adequate fascial plane release is important for optimal exposure. After identification of the disc space is confirmed with x-ray, preparation for anterior interbody fusion is commenced. (See Figure 2) Figure 2 The discectomy and resection of osteophytes is performed. Further preparation of the interbody fusion bed is performed. (See Figure 3) Figure 3 The OsteoStim Cervical Allograft Spacer System may be used to restore the disc height. (See Figure 4) Figure 4 6
Surgical Technique (Continued) Plate Positioning The Caliper estimates the appropriate length of the plate. Seat the prongs of the Caliper in line with the desired bone screw trajectory and read the measurement. Please note that the plate length is measured from the center hole of the inferior to superior bone screw holes. Plate Size Selection Select the appropriate plate length and place the Plate Holder on the lateral edge of the plate. Press the Plate Holder handles together to engage the locking mechanism and place the plate on the anterior surface of the spine. Review landmarks to ensure that the plate is centered appropriately on the vertebrae. Depress the handles to release the plate. Plate Insertion Option Alternatively, the Plate Clip may be used to insert the plate. Select the appropriate plate length and attach the Plate Clip over the lateral edges of the plate. Retract the sleeve of the Tack Inserter and load the hex portion of the Plate Clip. Release the sleeve and insert the plate. Once the plate has been positioned, re-attach the Tack Inserter on the Plate Clip and remove it from the plate. Adjust Curvature If additional lordosis is desired, moderate changes can be made to adjust the pre-contoured curvature of the plate. You have the option to increase or decrease your plate lordosis (reference Plate Bender etching). Seat the plate inside the Plate Bender and gradually depress the handle until the desired curvature has been achieved. Be careful not to bend the plate too much to avoid compromising the locking mechanism. 7
Surgical Technique (Continued) Tack Insertion (Optional) Retract the sleeve of the Tack Inserter and load the hex portion of the Tack. Release the sleeve and insert the Tack into the distal plate indentation or threaded hole of the plate. Indentation TIP: Tack placement will maintain plate in the proper position and aid in correct Bone Screw placement Load Drill Bits 4mm and 4.75mm Drill Bits are available with the standard set. Each Drill Bit is color-coded to the corresponding bone screw length. Load the selected Drill Bit into the Quick Connect Handle and select the appropriate Drill Guide. Positioning Drill Guide(s) The Drill Guide and Awl options with the system are: Fixed and Variable Drill Guide Tubes, Awl and Variable Adjustable Awl. Fixed and Variable Drill Guide Tubes Awl Variable Adjustable Awl 8
Surgical Technique (Continued) Fixed Drill Guide Tube The Fixed Drill Guide Tube is preset to a 10 angle cephalad and caudal. Turn the tube clockwise to lock by hand or drive assembly. Drill until the Drill Bit stop engages with the Drill Guide Tube. Rotate the drill in the opposite direction to remove the Drill Bit. To unlock, turn the tube counterclockwise. Variable Drill Guide Tube The Variable Drill Guide Tube permits a 20 cone of angulation, allotting for 10 in any plane. Turn the tube clockwise to lock by hand or drive assembly. Drill until the Drill Bit stop engages with the Drill Guide Tube. Rotate the drill in the opposite direction to remove the Drill Bit. To unlock, turn the tube counterclockwise. Awl Selection As an alternative to drilling, a Variable Adjustable Awl or Awl can be used to pierce the anterior cortex of the vertebral body. The awls pierce the anterior cortex to the minor diameter of a 4mm Bone Screw. The Awl penetrates to a 9mm depth with a Fixed or Variable Drill Guide. To use the Variable Adjustable Awl, depress the button on the handle and turn the sleeve clockwise to the desired depth marking (range 8-16mm). 9
Surgical Technique (Continued) Bone Screw Insertion The appropriate length and diameter of the bone screw can be verified using the Bone Screw Gauge on the Bone Screw Caddy. Select the appropriate length bone screw and diameter. Insert the distal tip of the Screw Driver into the bone screw head. The Screw Driver is designed so that the bone screw head will adhere to the tip geometry of the instrument. Insert the bone screw into the recess of the plate and turn the Screw Driver clockwise. Continue advancing the bone screw until the spherical threads interlock with the plate and an audible click is heard. Tilt the Screw Driver medially to release the bone screw. Fluoroscopy may be used to confirm the bone screw trajectory. OPTIONAL: The Soft Tissue Sleeve may be attached to the Screw Driver to move anatomical tissue out of the way during bone screw insertion. NOTE: The Torque Limiting Quick Connect Handle has a gold collar to distinguish between the Quick Connect Handle. The Torque Limiting Quick Connect Handle applies the appropriate torque to securely lock the bone screw in place. 10
Surgical Technique (Continued) Bone Screw Removal If a bone screw has been locked in place but needs to be removed, the Screw Driver is utilized. Assemble the Screw Driver Shaft to the Quick Connect Handle. Insert the distal tip of the Screw Driver into the hex shaped portion of the bone screw. Turn the bone screw counterclockwise to disengage the bone screw threads. A Plate Holder may be used to stabilize the plate during removal. OPTIONAL: If the bone screw head hex will not engage with the Screw Driver, use the Revision Screw Remover to disengage the bone screw. Assemble the Revision Screw Remover to the Quick Connect Handle. Insert the distal tip and turn counterclockwise until the spherical threads disengage. 11
Additional Surgical Options 1. Use caution when bending the plate near the threaded hole locations. 2. Be sure that all drill guides are fully seated into the plate bone screw hole to commence drilling. 3. If the drill guide is not positioned properly, the bone screw may be beyond the acceptable angle (which is defined by the Guide), and may crossthread into the plate. 4. As a reminder, after a bone screw is inserted through the plate, the bone purchase is 1mm less than the indicated length (i.e. 12mm Bone Screw is 11mm in bone). 5. The depth of drilling is controlled by an individual pre-set drill stop for each length bone screw. The Drill Bit is designed to create a pilot hole equivalent to the minor diameter of the bone screw. 6. Please note that the Drill Bits are color coded to match the bone screw length. 12
Closure And Postoperative Care Closure Implant Removal After implantation of the Cyprus Anterior Cervical Plate System is complete, closure is performed in layers according to standard protocol. Radiographs should be taken during surgery to confirm appropriate placement of the cervical plate and bone screws prior to closing. Removal of the Cyprus Anterior Cervical Plate is performed by reversing the order of the implant procedure. The Screw Driver is used first to remove the bone screws from the plate. If the screw driver cannot engage with the bone screw head, use the Revision Screw Remover to disengage bone screws. Postoperative Care Collar (soft or hard) immobilization may be used for comfort but also may be indicated given individual bone density and quality of fixation. This should be determined on an individual basis. Postoperative radiographs should be taken. 13
Regulatory Status Warnings Indications For Use The Cyprus Anterior Cervical Plate System implants are intended for temporary anterior interbody bone screw fixation of the cervical spine during the development of cervical spine fusion. The system is indicated for use in patients with degenerative disc disease (as defined by neck pain of discogenic origin confirmed by patient history and radiographic studies), trauma (including fractures), tumors, deformity (defined as kyphosis, lordosis, or scoliosis), pseudarthroses and/or failed previous fusion. Contraindications 1. Spinal infection or inflammation 2. Morbid obesity 1. This device is not approved for bone screw attachments to the posterior elements (pedicles) of the cervical, thoracic, or lumbar spine. 2. Selection of Implants: Selection of proper size, shape and design of the implant increases the potential for success. While proper selection can help minimize risks, the size and shape of human bones present limitations on the size and strength of implants. 3. Implant Strength and Loading: These devices are not designed to withstand the unsupported stress of full weight bearing and cannot withstand activity levels and/or loads equal to those placed on normal healthy bone. If healing is delayed or does not occur, the implant could eventually break due to metal fatigue. Loads produced by weight bearing and activity levels will dictate the longevity of the implant. 3. Mental illness, alcoholism, or drug abuse 4. Pregnancy 5. Metal Sensitivity/foreign body sensitivity 6. Open wounds local to the operative area 4. Corrosion: Contact of dissimilar metals accelerates the corrosion process, which could enhance fatigue fracture of the implants. Therefore, only use like or compatible metals with implants that are in contact with each other. See the Warnings, Precautions, and Possible Adverse Effects section of the package insert for a complete list of potential risks. 7. Rapid joint disease, bone absorption, osteopenia and/or osteoporosis. Osteoporosis is a relative contraindication since this condition may limit the degree of obtainable correction, the amount of mechanical fixation, and or intolerance 8. Patients with inadequate tissue over the operative site 14
Sterilization Recommendations The Cyprus Anterior Cervical Plate System is provided nonsterile, and must be sterilized prior to use. All packaging materials must be removed prior to sterilization. The following steam sterilization parameters are recommended: Cycle: Temperature: Time: Note: High Vacuum 270 F/132 C Eight minutes Allow for Cooling Individuals or hospitals not using the recommended method, temperature and time are advised to validate any alternative methods or cycles using an approved method or standard. 15
Ordering Information Implant Tray (88800) Plates Catalog # Description Qty. 1-Level 5001112 12mm Plate 2 5001114 14mm Plate 2 5001116 16mm Plate 2 5001118 18mm Plate 2 5001120 20mm Plate 2 5001122 22mm Plate 2 5001124 24mm Plate 2 2-Level 5001224 24mm Plate 2 5001226 26mm Plate 2 5001228 28mm Plate 2 5001230 30mm Plate 2 5001232 32mm Plate 2 5001234 34mm Plate 2 5001236 36mm Plate 2 5001238 38mm Plate 2 5001240 40mm Plate 2 5001242 42mm Plate 2 5001244 44mm Plate 2 Instrument Tray (88820) Instruments Catalog # Description Qty. 5001501 Quick Connect Handle 2 5001519 Torque Limiting Quick Connect Handle 2 55001605 Screw Driver 2 5001528 Plate Holder 1 5001527 Caliper 1 5001524 Tack Inserter 1 5001530 Awl 1 5001531 Variable Adjustable Awl 1 5001523 Revision Screw Remover Shaft 1 5001504 Soft Tissue Sleeve 2 5001508 Plate Bender 1 5001600 Fixed Drill Guide Tube 2 5001601 Variable Drill Guide Tube 2 5001512 Drill Guide Drill 4mm x 12mm 2 5001513 Drill Guide Drill 4.75mm x 12mm 1 5001514 Drill Guide Drill 4mm x 14mm 2 5001515 Drill Guide Drill 4.75mm x 14mm 1 5001516 Drill Guide Drill 4mm x 16mm 2 5001517 Drill Guide Drill 4.75mm x 16mm 1 5001604 Tack 2 5001529 Plate Clip 2 3-Level 5001344 44mm Plate 2 5001346 46mm Plate 2 5001348 48mm Plate 2 5001350 50mm Plate 2 5001352 52mm Plate 2 5001354 54mm Plate 2 5001356 56mm Plate 2 5001358 58mm Plate 2 5001360 60mm Plate 2 5001362 62mm Plate 2 5001364 64mm Plate 2 5001366 66mm Plate 2 16
Ordering Information (Continued) Implant Tray (88800) Self-Tapping Variable Bone Screws Catalog # Description Qty. Diameter Length Head Color Shaft Color 5000912 Self-Tapping Variable Bone Screw 8 4mm 12mm Light Green Light Green 5000914 Self-Tapping Variable Bone Screw 16 4mm 14mm Gold Gold 5000916 Self-Tapping Variable Bone Screw 8 4mm 16mm Dark Blue Dark Blue 5000962 Self-Tapping Variable Bone Screw 6 4.75mm 12mm Light Green Light Green 5000964 Self-Tapping Variable Bone Screw 6 4.75mm 14mm Gold Gold 5000966 Self-Tapping Variable Bone Screw 6 4.75mm 16mm Dark Blue Dark Blue Self-Tapping Fixed Bone Screws 5001012 Self-Tapping Fixed Bone Screw 8 4mm 12mm Light Green Light Green 5001014 Self-Tapping Fixed Bone Screw 16 4mm 14mm Gold Gold 5001016 Self-Tapping Fixed Bone Screw 8 4mm 16mm Dark Blue Dark Blue 5001062 Self-Tapping Fixed Bone Screw 6 4.75mm 12mm Light Green Light Green 5001064 Self-Tapping Fixed Bone Screw 6 4.75mm 14mm Gold Gold 5001066 Self-Tapping Fixed Bone Screw 6 4.75mm 16mm Dark Blue Dark Blue Self-Drilling Variable Bone Screws 5000913 Self-Drilling Variable Bone Screw 8 4mm 12mm Light Green Silver 5000915 Self-Drilling Variable Bone Screw 16 4mm 14mm Gold Silver 5000917 Self-Drilling Variable Bone Screw 8 4mm 16mm Dark Blue Silver 5000963 Self-Drilling Variable Bone Screw 6 4.75mm 12mm Light Green Silver 5000965 Self-Drilling Variable Bone Screw 6 4.75mm 14mm Gold Silver 5000967 Self-Drilling Variable Bone Screw 6 4.75mm 16mm Dark Blue Silver Self-Drilling Fixed Bone Screws 5001013 Self-Drilling Fixed Bone Screw 8 4mm 12mm Light Green Silver 5001015 Self-Drilling Fixed Bone Screw 16 4mm 14mm Gold Silver 5001017 Self-Drilling Fixed Bone Screw 8 4mm 16mm Dark Blue Silver 5001063 Self-Drilling Fixed Bone Screw 6 4.75mm 12mm Light Green Silver 5001065 Self-Drilling Fixed Bone Screw 6 4.75mm 14mm Gold Silver 5001067 Self-Drilling Fixed Bone Screw 6 4.75mm 16mm Dark Blue Silver 17
Additional Information CAUTION Federal Law (USA) restricts this device to sale by or on the order of a physician. The Cyprus Anterior Cervical Plate System Surgical Technique is presented to demonstrate the surgical techniques utilized by Gary Dix, M.D., Maryland Brain and Spine, Annapolis, MD; John Finkenberg, M.D., Alvarado Orthopedic Medical Group, Inc., San Diego, CA; Scot Miller, D.O., Crystal Clinic, Akron, OH; Douglas Wong, M.D., Panorama Orthopedics, Golden, CO; Philip Schneider, M.D., Director, Holy Cross Hospital Spine Center, Assistant Professor of Orthopedic Surgery, Howard University Medical School, Washington, DC. Biomet Spine, as the manufacturer of this device, does not practice medicine and does not recommend this product or any specific surgical technique for use on any individual patient. The surgeon who performs any implant procedure is responsible for determining the appropriate product(s) and utilizing the appropriate technique(s) for said implantation in each individual patient. For further information, please contact the Customer Service Department at: Biomet Spine 100 Interpace Parkway Parsippany, NJ 07054 (973) 299-9300 - (800) 526-2579 www.biometspine.com 18
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100 Interpace Parkway Parsippany, NJ 07054 www.biometspine.com 800-526-2579 All trademarks are the property of Biomet, Inc., or one of its subsidiaries, unless otherwise indicated. Rx Only. Copyright 2008 Biomet, Inc. All rights reserved. P/N 207015L 07/08